Bark removing machine



y 1945- c. F. KNIGHT BARK REMOVING MACHINE v Filed July 20, 1942 2 Sheets-Sheet l awyiam aar ATTORNEYS July 3, 1945. c. F. KNIGHT 3 5 BARK REMOVING MACHINE Filed July 20, 1942 2 Sheets-Sheet 2 J AITCIRNEY v Patented July 3, 1945 2379,53 t I BARK ai zMovnve MACHINE Claret reef} Pa. f

I Application my 20, 1942,

a. a "s pf- My' invention relates to" the removal of bark from pulp wood logs and the like, and has among its objects and advantages theprovisioirofan improved machine for removing bark from such IOg S'. V I Y Q In the accompanying drawings: Figure 1 is a side elevational view partly in section of a machine in accordance with my invention;

Figure 2 is a view taken from the position indicated by line 2-2 of Figure 1; I Figure 3 is a view taken from the position indicated by line 3-3 of Figure 1; and Figure 4 is a perspective view of a bark removing knife.

the lo g 4'4"dian1etrically opposite the gear at.

er'ialNoll 431,613 1 Thej disk 5'4'is keyed at 56 for-rotation as a unit with the shaft 2 6 i but free to move longitudinally *o'ffthe shaft. One'end of the shaft 26 is re- In the embodiment selected for illustration, 1' I make use of a base l0 upon which is mounted two frame members [2 and H, as by bolts I6, A hearing I8 is mounted on the base In for sup- This pinion meshes with a gear bers l2 and-l4. Upon the shaft 38 is secured a body 40, see Figure-3, which carries knives 42' for removing bark from the log 44 of Figure 1, which log is passed through the machine in right angular relationship to the shaft 38.

The body 40 is square in cross section and the knives 42 are secured to the body by screws 43 extending through openings 45 in the knives and threaded into the body 40. Each blade has a cutting edge 41 arranged at an angle ofabout twenty degrees to the back edge 49, this edge, being arranged in parallelism with the axis of the shaft 38. The blades taper gradually from their angular leading edge 5| to their back edge 49.

A gear 46 is rotatably mounted onthe shaft 38 and restrained from,axial movement thereon by reason of its engagement with the knifecarrying body 40 and a collar 48 secured to the shaft by a setscrew 50. The collar 48 lies in engagement with the frame member I2. The log 44 is pressed against one face of the gear 46, and this gear is driven by a pinion 52 secured to the shaft 26. On the shaft 26 is mounted a disk 54 having one face thereof engageable with tla'tably'supported in a" bearing sleeve 58 having screw threads 60' coacting with the internal thread formation 62 of a bushing 64 secured in a bore 66 in the frame member l4.

Upon the shaft 26 is mounted a compression spring 68 havingone end engaging a washer Ill pressed against the hub 12 of the disk 54 and its other end engaging a washer 14' engaging one end of the bearing sleeve 58. Thus the disk 54 is yieldingly pressed against the log 44, and the tension of the spring 68 may be adjusted through rotation of the bearing sleeve 58, the latter being provided with a handwheel 16 to facilitate such rotation.-

In operation, the pinion 52 is considerably smaller than the gear 46 so as to rotate the latter at half the speed of the disk 54. The gear 46 and the disk 54 rotate in opposite directions with the result that rotary motion is imparted to the log 44 to bring the bark into engagement with the knives '42 as the log 44 moves longitudinally and rotatably through the machine. 6'

The knives 42 arerotated at a sufficiently high speed to perform an efficient cutting action on the log. Positive engagement ;between the log and the gear 46 and the disk 54 is assured by reason .of the compression spring 68. Thus the resilient backing for the disk 54 compensates for variablelog sizes and irregularities therein.

The longitudinal travel of the log through the machine is caused by the slippage on the slower turning member. The blades are tapered so that as the log rotates the whole of its circumference ,will come in contact with the cutting edges as the log progresses longitudinally across the blades. p

The frame members I2 and I4 are braced at their upper ends by a brace rod '18.

Without further elaboration, the foregoing will so fully illustrate my invention, that others may,

by applying current knowledge, readily adapt the same for use under various conditions of service.

I claim:

l. A machine of the kind described, comprising a plurality of rotary shafts spaced from each other, a cutter rotated by one of the shafts and disposed crosswise of a log when operated upon by said cutter, a displaceable' disk on another of the shafts, and disposed longitudinally of the log and engaging the log at one side at'a point substantially aligned with the transverse axis of the log for imparting turning movement thereto, a gear loose on the cutter shaft and contacting the log on the side diametrically opposed to the side thereof contacted by the disk for longitudinally advancing the said log, a spring urging the disk toward the log, and a pinion carried by the disposed crosswise of a log when operated upon by said cutter, a displaceable disk on another of the shafts, and disposed longitudinally of the log and engaging the log on one side at apoint substantially aligned with the transverse axis of the log for imparting turning-movementthereto, a gear loose on the cutter shaft and contacting the log on the side diametrically opposed to the side thereof contacted by the disk for longitudinally advancing the said log, a spring urging the [disk towardthe "log a pinion carried by the shaft carrying the disk and of less size than the gear and meshing with the gear for driving the latter at less speed than the disk, a drive shaft and connections between the drive shaft and the shai't carrying the cutter.

3. A machine of the kind described comprising a plurality of rotary shafts spaced from each other, a cutter rotated by one of the shafts and disposed crosswise of a log when operated upon by said cutter, a displaceable disk on another of the shafts, and disposed longitudinally of the log and engaging the log on one side at a point substantially aligned with the transverse axis of the log for imparting turning movement thereto, a gear loose on the cutter shaft and contacting the log on the side diametrically opposed to the side thereof contacted by the disk for longitudinally advancing the said log, a spring urging the disk toward the log, a pinion carried by the shaft carrying the disk and of less size than the gear and meshing with the gear for driving the latter at less speed-than the disk, a drive shaft, and

" connections between the drive shaft and the 'ingand decreasing the tension of the disk. 1

shaft carrying the cutter, and means for increasthe-spring on CLARENGE F. KNIGHT. 

